When offering registration on a website with the options to signup with Facebook, Google, etc. What is the best way to say to register 'directly' with the website and not using any external third parties services.

i.e. for site xyz.com

Signup with Facebook

Signup with Twitter

Signup with Google

Signup directly with xyz.com??

To me, using the word 'directly' sounds a little clumsy, and not great English either.

I like the sites that present the option as two sides to a box. Sign up for an account or sign up using Facebook, Twitter, etc. (using the social icons). I can't think of an example right now. But I think this is the best compromise for the UX

Sign in to XYZ.com Or Sign in using
Username Facebook
Twitter
Google
Password
Not Registered?
Sign up here